Form panel with grouting plug core

ABSTRACT

An apparatus and method for constructing a concrete form comprised of a pair of form panels arranged in opposed spaced relationship and secured against movement relative to each other by tie rods extending therebetween. The apparatus comprises conical grouting cores secured to the panels independently of the rods to slidably receive the rods and permit their extension through the panels from the outer side of one of the panels, and waler brackets mounted on each of the panels for selective gripping engagement with the ends of the rods to prevent movement of the panels toward and away from each other. The brackets are provided with hinged jaw-like elements which are movable to effect selective engagement and disengagement of the brackets with the rods. When disengaged, these elements permit free slidable movement of the rods relative to the brackets. The method is directed to the construction of a concrete form by a &#39;&#39;&#39;&#39;feed through system&#39;&#39;&#39;&#39; wherein tie rods are fed through a pair of opposed panels and grouting cores secured thereto from the outer side of one of the panels. In the method, once the rods are fed through the panels, they are secured against axial movement relative thereto to maintain the panels in opposed spaced relationship. In an alternative embodiment, the apparatus and method is concerned with an arrangement wherein bushing inserts are secured to the panels in place of the conical grouting cores and cores or other sealing elements carried by the tie rods are cooperable with these inserts.

United States Patent 11 1 [111 3,801,061 Holt Apr. 2, 1974 FORM PANELWITH GROUTING PLUG [57] ABSTRACT CORE An apparatus and method forconstructing a concrete [75] Inventor: Jack Holt San Bruno, Calif formcomprised of a pair of form panels arranged in opposed spacedrelationship and secured against Asslghee? Burlfe Concrete fhccessm'ies-a movement relative to each other by tie rods extending Burhhgame:Cahftherebetween. The apparatus comprises conical grout- [22] Filed:July 2 971 ing cores secured to the panels independently of the rods toslidably receive the rods and permit their exl PP 159,151 tensionthrough the panels from the outer side of one Rdated Application Data ofthe panels, and waler brackets mounted on each of [60] Division of SCI.No. 824,359, April 30, 1969, Pat. the panels for Selectve gnppingengagement the 3693931, continuatiomimpan of ends of the rods to preventmovement of the panels 683,558, Nov 16, 1967, abandoned toward and awayfrom each other. The brackets are provided with hinged jaw-like elementswhich are 52 [1.5. Ci. 249/190, 249/217 movable to effect Selectiveengagement and disen- [51] Int. Cl. E04g 17/12 gagemeht of the bracketswith the rodswhen disen- [58] Field. of Search 249/40, 42, 43, 190, 191,gaged, these elements Permit free Slideble movement 249 2 3 2 27 1 9 ofthe rods relative to the brackets. The method is directed to theconstruction of a concrete form by a [56] References Cited feed throughsystem wherein tie rods are fed UNITED STATES PATENTS through a pair ofopposed panels and grouting cores secured thereto from the outer side ofone of the pani 3 618 887 11/1971 Erlks l'i l: 1:31.. 249 40 P they areh against movement rela 3:0206I6 2/1962 Marpe A v 249/40 tive thereto tomamtam the panels in opposed spaced I336IO3O 4/1920 Gammeter 271/189 Xrelationship. In an alternative embodiment, the appa- 3,437,306 4/1969Gates 249/43 rattle and method is Concerned with an arrangement1,027,565 5/1912 Ramage. 277/189 X wherein bushing inserts are securedto the panels in 2,383,570 8/1945 Sellen 277/189 X place of the conicalgrouting cores and cores or other 3,273,848 9/1966 Allen et a]. Wsealing elements carried the tie rods are cooperable FOREIGN PATENTS ORAPPLICATIONS with these inserts- 1,534,955 7/1969 Germany 249/43 4Claims, 10 Drawing Figures Primary Examiner-Robert D. Baldwin Attorney,Agent, or FirmNaylor, Neal & Uilkema PATENTEDAPR 2 m4 SHEET 2 UF 3INVENTOR.

JA 6K A. HOL r W MK ATTORNEYS This application is a division ofapplication Ser. No. 824,359, filed Apr. 30, 1969 now US. Pat. No.3,693,931 issued Sept. 26, 1972, which application in turn is acontinuation-in-part of my application Ser. No. 683,558, filed Nov. 16,1967, now abandoned.

The present invention relates to the art of constructing concrete formsand, more particularly, is directed to the construction of such formsfrom panels arranged in opposed spaced relationship and secured againstmovement relative to each other by tie rods.

In the prior art, various arrangements have been provided to constructconcrete formsfrom panels held in opposed spaced relationship by tierods extending therebetween. The most conventional of these arrangementssimply provide for the mounting of the rods to the inner side of one ofthe panels and then for the assembly of the other panel over the rods.With arrangements of this type, spacers are mounted on the rods forabutting engagement with the inner surfaces of the panels and walerbrackets are employed to force the panels against the spacers. Sucharrangements have the disadvantage that the panels must, in effect, beassembled around the rods. This disadvantage is particularly acute whenlarge difficult to handle gang form assemblies are employed.

To avoid the disadvantages inherent with prior art arrangements of theforegoing type, efforts have also beenmade to provide arrangementswherein tie rods may be fed through opposed panels from the outer sideof one of the panels and then secured in place. While these efforts havemet with some success, the arrangements employed therein also possesscertain inherent disadvantages, One of the disadvantages is that the tierods used in the arrangements must be formed with looped or notchedends, rather than the more conventional hot-upset ends. Anotherdisadvantage of these arrangements is that they have been incapable ofeffectively providing sealing and grouting cores around the rodsemployed therein. Such cores are necessary to prevent leakage of fluidconcrete around the rods and permit architectural finishing after thepanels are removed.

In summary, the present invention may be said to reside in a concreteform construction and method of fabricating the same. The constructioncomprises, as its basic elements, a pair of form panels disposed inopposed face-to-face relationship and having transversely alignedapertures extending therethrough. The apertures in at least one of thepanels have tubular grouting cores sealingly secured thereto andextending laterally toward the other of the panels. These cores slidablyreceive tie rods which extend between the panels and through the alignedapertures therein. Waler brackets mounted on the respective panelspermit the rods to be inserted from a position to one side of one of thepanels and, upon placement of the rods, are selectively operable tomaintain the rods against axial movement relative to the panels.

In its more specific aspects, the invention is concerned with thespecific construction of the grouting cores and the waler brackets. Thecores are adapted to be secured to the panels independently of the rodsand, together with cooperating sealing structure provided on the rods,to seal the openings in the panels to the flow of fluid concrete. Eachwaler bracket comprises a base member adapted to be fixed to the panelon which it is mounted and selectively operable gripping structureassociated with the member to apply tension imparting force to a rodwhile restricting its axial movement in either direction.

An alternative embodiment of the invention employs bushing insertssecured to the panels in place of the tubular grouting cores and coresor other sealing elements carried by the tie rods for cooperation withthe inserts.

It is, accordingly, a principal object of the present invention toprovide a concrete form construction .and method of fabricating the samewherein tie rods may be passed through opposed panels from a positiondisposed to one side of one of positioning of the tie rods in thismanner.

Still another object of the invention is to provide architecturalgrouting cores which may be securely mounted to form panels and permitthe substantially unrestricted axial movement of tie rods therethrough.

Yet another object of the invention isto provide a bushing insertadapted to be secured within the tie rod opening of aform panel to sealand protect the edges of the opening and act as a guide and bearingelement for a grouting core or other sealing element carried by a tierod extended through the opening.

These and other objects and the specifics of the invention will becomemore apparent whenlviewed in light of the accompanying drawings,wherein:

FIG. '1 is a perspective view illustrating the waler bracket and thepanel secured grouting core of the invention attached to a concrete formpanel having walers extending transversely thereacross, with the walersand form panel illustrated in partial section;

FIG. 2 is an exploded perspective view illustrating an entire concreteform construction employing form panels and hardware of the type shownin FIG. 1, with the form panels and walers incorporated thereinillustrated in partial section;

FIGS. 3 and 4 are sectional views taken on the planes designed by lines3-3 and 4-4, respectively, of FIG.

FIG. 5 is an exploded perspective view illustrating the components ofthe waler bracket;

FIG. 6 is a top plan view of the panel secured grouting core;

FIG. 7 is an exploded perspective view illustrating a concrete formconstruction incorporating the bushing inserts of the invention and afeed through tie rod carrying grouting cores cooperable with theinserts, with parts of the walers and form panels broken away and THEFIGS. 1 To 6 CONSTRUCTION Referring now to FIG. 1, a form panel istherein designated by the numeral 10 and is shown as having walers 12and 14 fixed thereto to either side of an aperture 16 (see FIG. 3)extending therethrough. This overall arrangement provides for bracing ofthe panel and the extension of tie rods therethrough. While only oneaperture and the walers cooperating therewith are illustrated, it is tobe understood that the panel would be provided with a plurality of suchapertures between the walers 12 and 14 and that other similarly providedwalers would be fixed to the panel where necessary.

The walers l2 and 14 have a waler bracket, designated in its entiretybythe numeral 18, mounted thereon. The bracket 18 comprises a base member20 fixedly secured in overlying relationship to the walers by nails 22and a tie rod gripping jaw 24 pivotally mounted on the base member forselective slidable movement thereover. Pivotal mounting of the jaw isprovided by post 26 secured to the member 20 and extending through anopening 28 (see FIG. 4) provided therefor in the jaw.

In the embodiment illustrated, the base member 20 is fabricated of apair of sheet metal plates fixedly welded together and having a centralaperture 30 extending therethrough. When the bracket is mounted, theaperture 30 is positioned in alignment with the aperture 16. In additionto the aperture 30, the base member 20 is provided with apertures 32 forreceipt of the nails 22, a pair. of outstanding detent protrusions 34and 36, and an outstanding stop protrusion 38. The protrusions 34 and 36are releasably engageable with the jaw 24 to selectively retain it inthe positions illustrated in FlGS. l and 2, respectively. The protrusion38 is positioned to abut with the jaw when it is engaged with theprotrusion 34.

The detailed construction of the jaw 24 may best be seen from FIG. 5.There it can be seen that the jaw is comprised of a detent member 44disposed for slidable engagement over the outer surface of the member 20and a retention member 46 fixed over the detent member. in the preferredembodiment, these members are fabricated of sheet metal and fixedlysecured together.

by spot welds 48 therebetween. Aligned apertures through the membersdefine, together, the opening 28. in addition to these apertures, themember 44 is provided with apertures 50 and 52 and an arcuate slot 54opening through one edge thereof and extending thereacross in concentricrelationship to the opening 28. The slot 54 is aligned with the aperture30 for passage thereover and around a tie rod extending therethrough.

The apertures 50 and 52 are disposed in alignment with the protrusions34 and 36, respectively, for passage thereover and releasable engagementtherewith. The latter engagement provides for the aforedescribedretention of the jaw in the alternative positions illustrated in FlGS. land 2.

The base member 20 and detent member 44 cooperate in much the samemanner as a conventional waler bracket in that they provide for theengagement of a tie rod end and the application of tension impartingforce thereto. To facilitate this operation, the member 44 is providedwith an inclined ramp portion 56 around the slot 54 and an upstandingear 58. The ramp portion 56 diverges outwardly relative to the basemember adjacent the open end of the slot 54 and terminates in a lengthsubstantially parallel to the base member at the closed end of the slot.The ear 58 is simply intended as a striking abutment to provide for theconvenient driving of the detent member with the hammer.

portion 60 disposed above and in spaced relationship to the portion 56and peripheral portions 62 and 64 secured directly to the member 44 bythe spot welds 48. The box portion 60 is of generally arcuate open endedconfiguration and flared out at 60a to facilitate the passage of a tierod therebeneath. The opening 28 extends through the portion 64; and ariveted over end on the post 26, together with washers 66 around thepost, function to maintain the jaw against lateral movement realtive tothe base member 20.

The manner in which a tie rod is engaged by the waler bracket 18 and theconstruction of the tie rod and the grouting core cooperating therewithmay be seen from FIG. 3. In this figure, the tie rod and grouting coreare designated, respectively, by the numerals 68 and 70. While only oneend length of the tie rod 68 is illustrated in FIG. 3, it is to beunderstood that both end lengths of the rod are similarly constructedfor extension through a form panel and engagement by a waler bracket.

The rod 68 is of the snap-tie type in that its end lengths are designedto be broken away by the application of torque thereto. The end lengthsand the intermediate length of the rods are designated by the numerals72 and 74, respectively. These lengths are integrally formed andprovided with adeformed enlarged collar-like portion 76 therebetween. Itis at the juncture of this collar portion and the length 74 that the endlengths are designed to break away. The rod is also provided withcrimped portions 78 in the lengths 72 adjacent the portions 76 andenlarged terminal end portions 80 of the hot-upset type at the distalends of the lengths 72. Washers 82 are concentrically received aroundthe rod and held against axial movement thereover by abutment with theportions 76 and 78. Each of these washers is designed to fit closelywithin the grouting core cooperating therewith to seal the core to theflow of fluid concrete therethrough, while permitting slidable movementof the rod within the core.

The core is of integral tubular configuration and defines a passage 84extending axially therethrough. The internal end lengths'of the passage84, designated by the numerals 86 and 88, are of hexagonal configurationfor turning engagement by an Allen wrench. The body of the core iscomprised of a truncated conical portion 90 and a cylindrical dowel-likeportion 92. The portion 90 diverges towards the portion 92 andterminates in a planar base surface 94 forming a juncture therewith. Theportion 92 isformed with self-threading external screw threads 96 forengagement with the aperture 16. When assembled as shown in F l0. 3, thepor tion 92 is threaded into engagement with the aperture 16 so as totighten the base surface into sealed engagement with the panel 10.

[t is here noted that the rods 68 and the washers 82 mounted thereon aredimensioned to pass, in their entirety, through the aperture 30 in thebase member of the waler bracket and the passage 84 in the groutingcore. Thus, the rods 68 may be inserted-into the position shown in FIG.3 from either side of the panel 10. The cross sections of the lengths 72and headare such that, once the rod is positioned, the jaw 24 may inabutting engagement with the undersurface of the head 80. The depth ofthe head 80 is such that, when the undersurface thereof is engaged withthe outermost length of the ramp portion 56, the outer surface thereofis in proximate abutting engagement with the underside of the boxportion 60. This overall interrelationship may be seen from FIG. 3. Itshould be appreciated that the distance between the ramp portion 56 andbox portion 60 is sufficient to permit the head 80 to pass freely to theposition shown in FIG. 3.

THE FIG. 1 TO 6 METHOD The method of employing the structure of FIGS. 1to 6 for the construction of a concrete form may best be seen from FIG.2. In this figure, two form panels are shown in the process of beingassembled in spaced opposed face-to-face relationship. The forward panelin this figure and the components mounted thereon are those of FIG. 1.The rearward panel, designated by the numeral 10a is a mirror image ofthe panel 10. The walers on the latter panel are designated by thenumerals 12a and 14a, respectively. The panel 10a and the walers 12a and14a are provided with hardware identical to that on the panel 10 and thewalers l2 and 14. This hardware, to the extent that it is illustrated,is designated by numerals corresponding to those used in the foregoingdiscussion.

To construct a form by the method illustrated in FIG. 2, the followingsteps are sequentially carried out:

1. The panels 10 and 10a are disposed in stacked face-to-facerelationship and aligned apertures (16) are drilled therethrough.

2. The walers and the waler brackets are securedto the respectivepanels.

3. The grouting cores 70 are securely screwed into the apertures.

4. The panels are disposed in opposed face-to-face relationship, asillustrated in FIG. 2, with the apertures in alignment.

5. The rod is passed through the panels from one side of one of thepanels (see the arrow line in FIG. 2).

6. The ends of the rods are engaged by the gripping jaws on therespective waler brackets to secure the rods against axial movementrelative to the panels and maintain the panels in opposed spacedrelationship. While the FIG. 2 illustration and the foregoingdescription are directed to the positioning of only one tie rod, it isto be understood that in actual practice a plurality of rods would besimilarly placed between the opposed form panels.

Once a concrete form is thus constructed, concrete is poured between thepanels and allowed to set. After the concrete has set, the panels may bereadily removed by releasing the gripping jaws of the waler bracketsfrom the tie rods and pulling the panels away from the formed concrete.During the latter operation, the grouting cores are pulled from the formconcrete with the panels and, thus, clean grouting pockets are provided.After removal of the panels, the end lengths of the tie rods may bereadily broken away by the application of torque thereto. It should beunderstood that, if desired, the end lengths may be broken away beforeactual removal of the form panels.

The removed panels may be readily reused by simply repeating the stepsof disposing the panels in opposed face-to-face relationship with theapparatus therein aligned and passing and securing a tie rod or rodsbetween the panels. In this operation, the tie rods are the onlyelements which need be renewed. The panels, walers, waler brackets andgrouting cores are all reused, since they remain secured together whenthe panels are removed from a previous pour of set concrete. In additionto facilitating their reuse, the secure mounting of the grouting coreshas the advantage that it functions to prevent the leakage of fluidconcrete between the cores and the panels.

THE FIG. 7 TO 10 CONSTRUCTION The form panels, walers, waler bracketsandthe parts thereof shown in these figures correspond identically tothose of FIGS. .1 to ,6 and, accordingly, are designated by likenumerals. The primary differences between the F IG. 1 to 6 constructionand the construction of FIGS. 7 to 10 reside in the employment ofbushing inserts in the tie rod apertures of the form panels rather thanthe panel secured grouting cores, and the provision of a modified tierod construction.

Referring now specifically to FIGS. 7 to 10, each bushing insert isdesignated therein in its entirety by the numeral 98. While two insertsare shown in FIG. 7, it should be understood that they are identical inconstruction. One insert is provided for each of the apertures 16 in thepanels 10 and 10a.

The insert 98, only one of which will be described in detail, is oftubular construction and defines a passage extending longitudinallytherethrough. The passage 100 terminates at one end in a hexagonalsocket 102 designed for the receipt of an Allen wrench. Externally, theinsert is provided with screw threads 104 designed for self-threadingreceipt in the tie rod apertures of a form panel. At one end, thesethreads terminate in a flared collar 106. The collar defines a flat endsurface at one end of the insert and is of generally frustoconical crosssection. Through the latter provision, the collar is adapted to be drawninto the tie rod aperture of a form panel to a position wherein the flatend surface is flush with the interior surface of the panel. Such adisposition is shown in FIGS. 8 and 9. Ideally, the length of thebushing insert is substantially equal to the thickness of the form panelin which it is used.

The preferred tie rod for use with the bushing inserts 98 is shown inFIGS. 7 and 8 and designated in its entirety by the numeral 68a. Thisrod is similar to the aforedescribed rod 68 in that it is of thesnap-tie type. The end lengths of the rod are each designated by thenumeral 72a and the length intermediate the end lengths is designated bythe numeral 74a. Between each of the end lengths and the intermediatelength a deare hot-upset" similarly to the ends of the aforedescribedrod 68.

Grouting cores, designated 110, employed with the tie rod 68a areconcentrically received on and carried by the end lengths 724. Thesecores are snugly received on the rod in abutting engagement with thecollars 760.

Each core is comprised of generally frusto-conical end portions 112 and114 and an intermediate cylindrical portion 116. The portions 116 andproportioned for THE FIG. 7 AND SMETHOD The method of employing thestructure of FIGS. 7

and 8 for the construction of a concrete form is sequentially carriedout to the following steps:

I. The panels 10 and 10a are disposed in stacked facing relationship andapertures (16) are drilled therethrough.

2. The walers and waler brackets are secured to the respective panels.

3. The bushing inserts 98 are securely screwed into the apertures to thecondition illustrated in FIG. 8.

4. The panels are disposed in opposed face-to-face relationship, asillustrated in FIG. 7, with the apertures in alignment. i

5. The rod 74a is passed through the panels from one side of one of thepanels.

6. The ends of the rods are engaged by the gripping jaws on therespective waler brackets to secure the rods against axial movementrelative to the panels and maintain the panels in opposed spacedrelationship with the cylindrical sections 116 of the grouting cores 110received in the bushing inserts 98.

The latter condition can be seen from FIG. 8. It should be understoodthat the rod 68 and the cores 110 are so proportioned that the cores arepositioned as shown in FIG. 8 when the terminal end portions 80a arefully gripped by the waler brackets. Ideally, this disposes the groutingcore so that the line of demarcation between the endportion 112 and thecylindrical portion 116 is substantially coincident with the flat endsurface on the flared collar 106.

In use, once a concrete form is thus constructed, concrete is pouredbetween the panels and allowed to set. After the concrete has set, thepanels may be readily removed by releasing the gripping jaws of thewaler brackets from the tie rods and pulling the panels from the formedconcrete. After removal of the panels, the end lengths of the tie rodsare snapped and removed, together with the grouting cores 110. Thus,clean grouting pockets are provided in the surfaces of the formedconcrete. It should be understood that, if desired, the end lengths andgrouting cores may be broken away before removal of the form panels.

The-removed panels may be readily reused by simply repeating the stepsof disposing the panels in opposed face-to-face relationship with theapertures therein aligned and passing and securing the tie rods betweenthe panels. In this operation, the tie rods and the grouting corescarried thereby are the only elements which need to be renewed. Thepanels, walers, waler brackets and bushing inserts are all reused, sincethey remain secured when the panels are removed from a previous pour ofconcrete.

ALTERNATIVE USE OF THE FIG. 7 TO 10 CONSTRUCTION The phantom linerepresentation of FIG. 9 illustrates the manner in which the bushinginsert 98 may be used with a conventional snap-tie tie rod. With thistype of rod, the form panels are assembled around the tie rod and thefeed through system is not employed. The employment of the bushinginsert in this environment functions to seal and protect the edges ofthe tie rod opening in the form panel and provide a smooth bearingsurface for the grouting core carried by the tie rod. The tie rod andgrouting core in FIG. 9 are designated, respectively, by the numerals118 and 120.

Where a grouting pocket is not desired, the bushing insert 98 may beused in a manner similar to that shown in FIG. 9, but with a washer typetie rod. In such an environment, the washer would take the place of thegrouting core 120 and be carried by the tie rod for abutting sealingengagement with the flat end surface of the collar 106.

CCNCLUSION From the foregoing description, it is believed appar ent thatthe present invention enables the'attainment of the objects initiallyset forth herein. This is believed especially evident from thecharacteristics of the invention which provide for the feeding of tierods through opposed panels from a position to one side of one of thepanels and for the reuse of all of the forming components, with theexception of the snap-tie rods and the elements carried thereby. Themanner 'in which the reusable components remain secured to the panels atall times is particularly advantageous from a labor saving standpoint ingang form assemblies.

I claim:

1. A grouting plug core for use in combination with a form comprising: 1

A. a form panel having an interior surface against which concrete isformed and an aperture therein for the passage of a tie rodtherethrough;

B. a tie rod extending through said aperture; and,

C. gripping means mounted to said panel for selective engagement withsaid rod to lock said panel against axial movement relative to said rod;

said core comprising: I

l. a truncated conical body having:

a. a substantially planar base surface adapted to seat against theinterior surface of said panel and over the aperture therein with thebody extending outwardly from said interior surface, said base surfacehaving an area greater than the transverse cross sectional area of saidaperture and said body converging uniformily from. said base surface todefine a smooth conical exterior surface; and,

b. a passage extending generally axially therethrough, said passagebeing adapted to have said rod passedtherethrough upon seating of saidsurface against said panel and over the aperture therein;

2. dowel means secured against axial movement relative to said body andextending laterally from the base surface thereof, said means beingreceivable in the aperture of said panel 'to maintain said surface in analigned position covering said aperture and being adapted to have saidrod passed therethrough; and, Y

3. retention means adapted to secure said dowel means against axialmovement relative to the panel and in received condition within theaperture therein.

2. A grouting plug core according to claim 1,

wherein:

A. said dowel means comprises a tubular section formed integrally and insubstantially axial alignment with said body; and,

B. said retention means comprises a screw threaded surface formed on andexternally of said tubular section for gripping engagement with theinternal surface of an aperture within which said dowel means isreceived.

3. A grouting plug core according to claim 2, further comprising wrenchengageable means operatively associated with said dowel means to providefor the turning thereof with a wrench to selectively thread said screwthreaded surface into and out of gripping engagement with the internalsurface of an aperture.

4. A grouting plug core for use in combination with a plywood form panelhaving an interior surface against which concrete is formed and a tierod aperture extending therethrough, said core comprising:

A. a truncated conical body having:

1. a substantially planar base surface adapted to seat against theinterior surface of the panel and over the aperture therein with thebody extending outwardly from said interior surface, said base surfacehaving an area greater than the transverse cross sectional area of saidaperture and said body converging uniformly from said base surface todefine a smooth conical surface which will form a smooth flange-freeconical recess in the face of a concrete slab formed against theinterior surface of the panel: and,

2. a passage extending therethrough, said passage being adapted to havethe rod passed therethrough upon seating of said base surfaceagainst thepanel and over the aperture therein;

B. a dowel formed integrally with said body and extending laterally fromthe base surface thereof, said dowel having screw threads on theexternal surface thereof for self-threading engagement with the aperturein the form panel to draw the base surface into seated engagement withthe panel.

1. A grouting plug core for use in combination with a form comprising:A. a form panel having an interior surface against which concrete isformed and an aperture therein for the passage of a tie rodtherethrough; B. a tie rod extending through said aperture; and, C.gripping means mounted to said panel for selective engagement with saidrod to lock said panel against axial movement relative to said rod; saidcore comprising:
 1. a truncated conical body having: a. a substantiallyplanar base surface adapted to seat against the interior surface of saidpanel and over the aperture therein with the body extending outwardlyfrom said iNterior surface, said base surface having an area greaterthan the transverse cross sectional area of said aperture and said bodyconverging uniformily from said base surface to define a smooth conicalexterior surface; and, b. a passage extending generally axiallytherethrough, said passage being adapted to have said rod passedtherethrough upon seating of said surface against said panel and overthe aperture therein;
 2. dowel means secured against axial movementrelative to said body and extending laterally from the base surfacethereof, said means being receivable in the aperture of said panel tomaintain said surface in an aligned position covering said aperture andbeing adapted to have said rod passed therethrough; and,
 3. retentionmeans adapted to secure said dowel means against axial movement relativeto the panel and in received condition within the aperture therein.
 2. Agrouting plug core according to claim 1, wherein: A. said dowel meanscomprises a tubular section formed integrally and in substantially axialalignment with said body; and, B. said retention means comprises a screwthreaded surface formed on and externally of said tubular section forgripping engagement with the internal surface of an aperture withinwhich said dowel means is received.
 2. a passage extending therethrough,said passage being adapted to have the rod passed therethrough uponseating of said base surface against the panel and over the aperturetherein; B. a dowel formed integrally with said body and extendinglaterally from the base surface thereof, said dowel having screw threadson the external surface thereof for self-threading engagement with theaperture in the form panel to draw the base surface into seatedengagement with the panel.
 2. dowel means secured against axial movementrelative to said body and extending laterally from the base surfacethereof, said means being receivable in the aperture of said panel tomaintain said surface in an aligned position covering said aperture andbeing adapted to have said rod passed therethrough; and,
 3. A groutingplug core according to claim 2, further comprising wrench engageablemeans operatively associated with said dowel means to provide for theturning thereof with a wrench to selectively thread said screw threadedsurface into and out of gripping engagement with the internal surface ofan aperture.
 3. retention means adapted to secure said dowel meansagainst axial movement relative to the panel and in received conditionwithin the aperture therein.
 4. A grouting plug core for use incombination with a plywood form panel having an interior surface againstwhich concrete is formed and a tie rod aperture extending therethrough,said core comprising: A. a truncated conical body having: